SMALL BLIND FISH. 901 
Kyes rudimentary, concealed under the skin; surface of head crossed by vertical, 
tactile ridges; gill-membranes fally joined to isthmus; ventral fins present, quite small, 
close to anal ; colorless fishes of small size, inhabitin g the cave streams in the limestore 
regions of the Western States. @ 
AMBLYOPSIS sPELUS DeKay. 
Larger Blind Fish of the Mammoth Cave. 
Amblyopsis speleus, DkeKay, New York Fauna, Fishes, 1842, 147.—WyMAN, Amer. Journ. 
Sci. Arts, 1843, 94; Ann. Mag. Nat. Hist., xii, 1843, 298; Proc. Bost. Soc. Nat. Hist., 
1850, 349, and elsewhere.—THOompson, Ann. Nat. Hist., 1844, 112.—TELLKAMpPF, 
Miiller’s Arch., 1844, 381.—Agcassiz, Amer. Journ. Sci. Arts, 1851, 127.—Pory, Mem. 
Cuba, 104.—GUNTHER, Cat. Fish. Brit. Mus., vii, 1868, 2,—PUTNAM, JORDAN, and of 
all writers generally. 
Description.—Colorless ; mouth comparatively large, the length of its cleft about equal 
to the base of dorsal] ; pectorals reaching front of dorsal ; caudal long, rather pointed ; 
one pyloric ccecum ; ona 3 in length; depth 44; D.&; V.4. Length 5 inches. 
Habitat, subterranean streams of Kentucky and Indiana. Mammoth Cave, etc. 
GENUS TYPHLICHTHYS. Girard. 
Typhlichthys, GIRARD, Proc. Acad, Nat. Sci. Phila., 1859, 62. 
Amblyopsis, sp.. GUNTHER. 
Chologaster, sp., GILL. 
Type, Typhlichthys subterraneus, Girard. 
Etymology, tuphlos, blind ; ichthus, fish. 
This genus-may be known by its biindness and by the absence of the ventral fins. 
TYPHLICHIHYS SUBTERRANEUS Girard. 
Smali-blind Fish. 
Typhilichthys subterraneus, GIRARD, Proc, Acad. Nat. Sci. Phila., 1859, 62, and of Patnam, 
Jordan, and late writers generally. 
Amblyopsis speleus, variety without ventral fins, GUNTHER, 1. c¢. 
Description.—Colorless ; head rather blunter and broader forwards than in A, SAEs fs 
mouth smaller, its cleft shorter than base of dorsal; pectorals scarcely reaching dorsal ; 
one pyloric cecum; D.7 or 8; A.7or8. Length, 2 inches. 
Habitat, subterranean streams of Kentucky, Tennessee, and Alabama. 
GENUS CHOLOGASTER. Agassiz. 
Chologaster, AGassi1z, Amer. Journ. Sci. Arts, xvi, 1€53, 135. 
Type, Chologaster cornutus, Agassiz (from South Carolina). 
Etymology, cholos, deficient ; gaster, belly, (from the lack of ventral fins). 
This genus has the general characters of Amblyopsis, but differs in the absence of ven- 
tral fins and in the fully developed condition of the eyes, which are small and lateral ; 
the species are not pellucid, but colored like ordinary fishes; no papillary ridges; 
pylor_c caeca 2. 
